Primary-secondary-spread crossbar telephone system



April 6, Y1954 J. l. BELLAMY ETAL 55 Sheets-Sheet l 55 Sheets-Sheet 2 J. l. BELLAMY ETAL PRIMARY SECONDARY SPREAD CROSSBAR TELEPHONE SYSTEM m mom N n wxzj mz3 o9 V wmzj whom Fileld April 4, 1949 AT TORN EY April 6, 1954 J. l. BELLAMY ET AL PRIMARY-SECONDARY-SPREAD CROSSBAR TELEPHONE SYSTEM Filed April 4, 1949 55 Sheets-Sheet 3 NnN I' 95 ut I @mmm P nl OV no @mow 9mm llrl l ov o M @5m ummm v i s 80km 9mm Y 9. u. n USN mmm 1 s mommnm @um WT m... mo

INVENTORS: JOHN BELLAMY THr-:RoN 1 .BowsER BY l ATTORNEY April 6, 1954 J. l. BELLAMY ET AL 2,574,657

PRIMARY-SECONDARY-SPREAD cRossBAR TELEPHONE SYSTEM Filed April 4, 1949 55 Sheets-Sheet 4 April 6, 1954 J. l. BELLAMY ETAL 2,674,657

PRIMARY-SECONDARY-SPREAD CROSSBR TELEPHONE SYSTEM Filed April 4, 1949 55 Sheets-Sheet 5 OO .SYS f -M --H-u-l-l-s-L Nl l l`l l l NI l TERM I NATINGTRUNK CABLES TA TO TD OUTGOING-TRUNK CABLE OTC lNVENTORSI JOHN l. BELLAMY THERON h. BOWSER FIG.. 3

PART 4 ATTORNEY April 6, 1954 J. l. BELLAMY ET AL PRIMARY-sEcoNDARY-SPREAD cRossBAR TELEPHONE SYSTEM Filed April 4, 1949 55 Sheets-Sheet 6 April 6, 1954 J. l. BELLAMY ETAL PRIMARY-SECONDARY-SPREAD CROSSBAR TELEPHONE SYSTEM 55 Sheets-Sheet 7 Filed April 4, 1949 ATTORNEY April 6, 1954 J. l. BELLAMY ET AL PRIMARY-SECONDARY'SPREAD CROSSBAR TELEPHONE SYSTEM 55 Sheets-Sheet 8 Filed April 4, 1949 INVENTORSI JOHN I. BELLAMY ATTORNEY THERON L. BOWSER April 6, 1954 J. l. BELLAMY ET AL PRIMARY-SECONDARY-SPREAD CROSSBAR TELEPHONE SYSTEM Filed April 4, 1949 55 Sheets-Sheet 9 |.BELLAMY ETAL April 6, 1954 55 Sheets-Sheet 10 m l.Y Mm n nvA O N TLB R NIN O EEL T N T mmjochzoo mo mmm .A 3W H E w m zo mooN am. nz. g -m 1.5 -m. .lm ovN A mNNN Y [L lmooz mwzotsw xmooo. NjcEzooINz... i .w E s. 2m. zon om- .fmQN mi l Sfln NL` 1|H mzN- .TIA mN N w rIIIIII f f f ,E TI n NON. mz: 5963 Mom om m9. N v9. 32mm L f zo@ 1 :w @op 5E mz3 n.: sw f @z zE f 3.35 moN :I ,m J z: m NSV WT w f L f l P r o N md.: NoN wucsmmmoom mNoN x23 mz: P moom rocswdmw F NSN\ b k w ooN NDOQTL l. k 6 .I iF L NNONI, l Il NoN fm v o Nwzoxm o fNoN NNN NEEN mmnoolxz J 5E @2.850 oNoN\ April 6, 1954 J. l. BELLAMY ET AL 2,674,657

PRIMARY-sEcoNDARY-SPREAD cRossBAR TELEPHONE SYSTEM ATTORNEY April 6, 1954 J. l. BELLAMY ET AL 2,674,657

SECONDARY-SPREAD QRossBAR TELEPHONE SYSTEM PRIMARY 55 Sheets-Sheet 12 Filed April 4, 1949 A ToRNr-:Y

April 6, 1954 PRIMARY-SECONDARY-SPREAD CROSSBAR TELEPHONE SYSTEM Filed April 4, 1949 LINE-CONTROLLER swlTcH l IOIO Fegl() J. l. BELLAMY E T AL 2,674,657

55 Sheets-Sheet 13 VERTICAL BANK STRIPS SWS-IO FROM SWITCHES 800 ro/FROM swrrcHEs eoo Ton-'Romv WlTcHEs soo HOLD MAGNETS mvau'roRs; JOHN LBELLAMY THERoN 1 BowsER PAM 1 April 6, 1954 J. l. BELLAMY x-:T AL 2,674,657

PRIMARY-SECONDARY-SPREAD CRossBAR TELEPHONE SYSTEM Filed April 4, 1949 55 Sheets-Sheet 14 SELECT MAGNETS TO/FROM LINE CONTROLLER FIG. I2

TO/FROM SWITCHES 800 TO/FBOM SWITCHES 800 TO/FROM SWITCHES 800 IOIO INVENTORS: JOHN l. BELLAMY T HERON L. BOWSER ATTORNEY J. l. BELLAMY ET Al. 2,674,657

PRIMARY-SECONDARY-SPREAD CROSSBAR TELEPHONE SYSTEM 55 Sheets-Sheet 15 Filed April 4, 1949 April 6, 1954 J. BELLAMY ET AL 2,674,557

PRIMARY-SECONDARY-SPREAD cRossBAR TELEPHONE SYSTEM Filed April 4, 1949 55 Sheets-Sheet 16 TO/FROM LINE CONTROLLER FIG. I2

SELECT MAGNETS TO/FROM SWITCHES 800 TO/FFOM SWITCHES BOO TO/ FROM SWITCHES 800 INVENTORSI JOHN I. BELLAMY THERON L. BOWSER BY .mju/f" AT ORNEY April 6, 1954 J. l. BELLAMY ETAL PRIMARY-SECONDARY-SPREAD CROSSBAR TELEPHONE SYSTEM Filed April 4, 1949 55 Sheets-Sheet 17 S5 sheets-sheet 18 J. l. BELLAMY ET Al.

SECONDARY-SPREAD cRossBAR TELEPHONE SYSTEM PRIMARY April 6, 1954 Filed April 4, 1949 mmmkm O...

April 6,1954 J. l. B-ELLAMY ETAL PRIMARY-sEcoNDARY-SPREAD cRossBAR TELEPHONE SYSTEM Filed April 4, 1949 55 Sheets-Sheet 19 April 6, 1954 J. l. BELLAMY ET AL PRIMARY-SECONDARY-SPREAD cRossBAR TELEPHONE SYSTEM Filed April 4, 1949 v 55 Sheets-Sheet 2O 

